Infacol anti-colic - not convinced, but worth a go

Infacol is an inexpensive over the counter anti-colic medicine that contains the same active ingredient as preparations used to treat acid reflux in adults.

It can be difficult to get the dropper into the child's mouth - if they like it they can get over-excited and splatter it everywhere, if they don't it can drip away before you find away to get it in their mouth. It's orange flavoured, and generally they do like it, but personal experience has shown it to be pretty ineffective. That said it can calm a screaming baby simply because they like it and associate it with food, thus screaming less and producing less wind. A placebo effect is better than none at all.